Is your mouse calibrated ?
You should do this every few days.
More often if you spend a lot of time on your computer.
I was shocked to see that this works !

To re-calibrate your mouse, click and hold on the S below. Then drag the S toward the ?
If it doesn't work, you might want to clean your mouse.

Surely you didn't believe Mel again did you ?

Calibrate & Clean Your Mouse Regularly

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